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T in (-oo:+oo)
T/2.5 = 5.2 // - 5.2
T/2.5-5.2 = 0
0.4*T-5.2 = 0 // + 5.2
0.4*T = 5.2 // : 0.4
T = 5.2/0.4
T = 13
T = 13
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